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Commit Graph

11 Commits

Author SHA1 Message Date
Muhammad Faiz
da34e4e132 swresample/soxr: fix invalid use of linear_interp
give very bad quality for soxr resampler.
linear_interp is intended for  using linear interpolation
between filter bank so quality will be better.

i guess this is misunderstood as 'do not use filter bank,
but directly interpolate linearly between samples'.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
2016-11-26 05:52:24 +07:00
Muhammad Faiz
b8c6e5a661 swresample: add exact_rational option
give high quality resampling
as good as with linear_interp=on
as fast as without linear_interp=on
tested visually with ffplay
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000, showcqt=gamma=5"
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:exact_rational=on, showcqt=gamma=5"

slightly speed improvement
for fair comparison with -cpuflags 0
audio.wav is ~ 1 hour 44100 stereo 16bit wav file
ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
        old         new
real    13.498s     13.121s
user    13.364s     12.987s
sys      0.131s      0.129s

linear_interp=on
        old         new
real    23.035s     23.050s
user    22.907s     22.917s
sys      0.119s     0.125s

exact_rational=on
real    12.418s
user    12.298s
sys      0.114s

possibility to decrease memory usage if soft compensation is ignored

Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
2016-06-13 12:36:01 +07:00
Ganesh Ajjanagadde
1bed09a30e swresample: allow double precision beta value for the Kaiser window
Kaiser windows inherently don't require beta to be an integer. This was
an arbitrary restriction. Moreover, soxr does not require it, and in
fact often estimates beta to a non-integral value.

Thus, this patch allows greater flexibility for swresample clients.
Micro version is updated.

Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-11-08 21:11:07 -05:00
Rob Sykes
c70c6be225 swresample: soxr implementation for swr_get_out_samples()
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-06-21 23:38:44 +02:00
Michael Niedermayer
4d00860ac7 swresample: Add prefix to soxr_resampler
also move declaration to header

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-02-27 19:20:43 +01:00
Rob Sykes
4b6f225374 swresample/soxr_resample: fix error handling
Fixes CID1257659

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-12-13 21:12:56 +01:00
Ronald S. Bultje
b785c62681 swr: handle initial negative sample index outside DSP function.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-06-14 14:36:18 +02:00
Rob Sykes
dc666d360b soxr: libsoxr 0.1.1 support
Libsoxr 0.1.1 will be out very soon; no changes planned beyond what's currently in git.
It includes a couple of fixes (not affecting FFmpeg's current usage) and a minor API change (but remains ABI compatible).

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-03-01 14:38:02 +01:00
Rob Sykes
03d38ee207 soxr_resample: soxr API parameter rename
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-12-27 11:59:55 +01:00
Rob Sykes
f2957adb23 soxr_resample: Correct email address
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-12-27 11:58:16 +01:00
Rob Sykes
801b315729 swr: Add SOX resampler support
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-12-11 22:04:00 +01:00